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Related Party Transactions
12 Months Ended
Dec. 31, 2020
Related Party Transactions [Abstract]  
Related Party Transactions Disclosure [Text Block] Related Party Transactions
During the third quarter of 2019, Carl C. Icahn and his affiliates (shareholders) increased their ownership interest in the Company. In the normal course of business, the Company provides services to, and purchases from, certain related parties with the same shareholders. The services provided to these entities included those related to human resources, end-user support and other services and solutions. The purchases from these entities included office equipment and related services and supplies. Revenue and purchases from these entities were included in Revenue and Costs of services or Selling, general and administrative, respectively, on the Company's Consolidated Statements of Income (Loss).

Transactions with related parties were as follows:

Year Ended December 31,
 (in millions)202020192018
Revenue from related parties$24 $33 $45 
Purchases from related parties$36 $46 $41 

The Company's receivable and payable balances with related party entities were not material as of December 31, 2020 and 2019.